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2/3+1/7等于多少

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2/3+1/7 =14/21+3/21 =17/21

15/7+1/3等于 先分析,这是分数的加法 再看,分母不同,需要通分;7与3的最小公倍数为21, 15/7+1/3=45/21+7/21=52/21

7/9×(3/2+9/7)+1/2 =7/9×3/2+7/9×9/7+1/2 =7/6+1+1/2 =2又2/3

3/8x1/7=3/56

解: 7/12*2/3+1/3*7/12 =7/12*(2/3+1/3)=7/12*1 =7/12 简便算法哦

由于 1+1= (1+1) +1 =3 2+2= (2+2) +1 =5 3+3= (3+3) +1 =7 所以按照这样的规律可得: 4+4= (4+4) +1 =9

7/9+2/9÷1/3 =7/9+2/9x3 =7/9+6/9 =13/9 =1又4/9

3/2*5/7-5/7*5/2-5/2*1/7 =3/2*5/7-5/7*5/2-5/7*1/2 =(3/2-5/2-1/2)*5/7 =-3/2*5/7 =-15/14

=1/14x7/25+2/5=7/350+2/5=147/350

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